The Commonwealth Games are a multi-sport games competed by national teams from countries in the Commonwealth. The games are similar in format to the Summer Olympics, and are held every four years, two years apart from the Olympics. The first games were held in 1930 as the British Empire Games.
The Commonwealth mainly consists of countries which used to be part of the British Empire, and 53 nations are members. However as the home nations of the UK and British Overseas Territories have their own teams there are 71 teams.
The Glasgow games were the sixth to be held in the UK and the third to be held in Scotland. The games were held in Edinburgh in 1970 and 1986, and in Manchester in 2002. A few of the venues used this year were used for earlier Edinburgh games, particularly the Royal Commonwealth Pool in Edinburgh which is being used for diving for the third games.